When placed in a conventional table lamp most LED light bulbs, including this LG bulb, have a tendency to illuminate upwards. This is because of the horizontal placement of the LED emitters inside. The Philips bulbs use three vertically oriented LED panels to alleviate this concern. However, in an over the shoulder reading lamp or a task lamp, the bulb illuminates uniformly and does not throw any heat on the illuminated target.
The LG light bulb illuminates mostly upwards because of the horizontal
placement of the LED panel inside the bulb (click on image to enlarge).
The design of table lamps is meant to accommodate the Edison light bulb, which emits light in all directions. The spindle allows the electrical cord to reach the bulb and the lamp shade serves as a diffuser. The shade, being open top and bottom, allows the natural convection to take away the unwanted heat. It also enables easy replacement of the short-lived bulb. The electric table lamp has evolved over more than a century to accommodate the light bulb and is very different from its precursor luminaire, the oil lamp.
The very first electric lamps were not necessarily very effective or very popular, yet their advantages prevailed and the use of oil lamps waned. Over time, and probably rather rapidly, lamps will evolve to adapt to the peculiarities of the LED sources. When LED light sources achieve lifetimes in decades, replacing them will no longer be a concern and luminaires will take on various forms and shapes. Meanwhile, forcing LEDs to assume the Edison format is akin to forcing a square peg into a round hole.
Nevertheless, Strategies Unlimited predicts that "the global market for replacements for legacy lighting sources will grow from $2.2 billion in 2011 to $3.7 billion in 2016." Indeed, LED light bulbs provide very pleasant illumination, much more agreeable than compact fluorescent bulbs, and they will be adopted eagerly. They outlast CFLs, contain no mercury, and are instant-on. One annoying trait of CFLs is that they take a relatively long time to reach their maximum level of illumination.
LED light bulbs are complex electronic devices. The LEDs themselves are semiconductor diodes, wanting a low voltage DC supply, typically around 3 volts. Common household supply is 110V or 220V AC depending on geographic location. The LG bulb is not dimmable. More expensive models are dimmable, although newer types of dimmers may be needed. Like CFL bulbs, LED bulbs have a small circuit board stuffed inside the neck.